Results 91 to 100 of about 19,176 (260)
Diastereoselectivity in the annulation of phosphenes and imines
Diastereoselectivity in the annulation of phosphenes and imines is investigated via the reaction of β-phosphoryl diazoalkanes and conjugative α,β-unsaturated imines.
Chengzhuo Wang, Jiaxi Xu, Yuhua Chen
core +1 more source
Divergent Diastereoselectivity in the Addition of Nucleophiles to Five-Membered-Ring Oxonium Ions
, 2016 Divergent Diastereoselectivity in the Addition of Nucleophiles to Five-Membered-Ring Oxonium ...
K. A. Woerpel (1312464) +1 more
core +1 more source
FLP Mediated Conversion of Difluorobenzylalkynes to Fluoroallenyl Oniums via an SN1’ Pathway
Chemistry – A European Journal, EarlyView.Frustrated Lewis pair (FLP) selective C‒F activation of difluorobenzylalkynes allows the formation of fluoroallenic oniums via an SN1’ substitution pathway. The fluoroallenic onium salts are synthetic precursors that allow subsequent functionalization at allenic and onium positions.
Max Coles +6 more
wiley +1 more source
Solvent-controlled diastereoselectivity in tryptophan-catalyzed Mannich reactions [PDF]
, 2018 Solvent effects in the L-tryptophan-catalyzed Mannich reaction between hydroxyacetone and glyoxylate imines have been examined. The use of a DMSO/1-butanol (4:1 v/v) mixture as solvent at rt provided the expected Mannich adducts in good yields, high anti-
Moyano i Baldoire, Albert +2 more
core +1 more source
Chemistry – A European Journal, EarlyView.Nitrooxylation—the installation of nitrate esters (–ONO2) has evolved from classical mixed‐acid protocols to catalytic and mechano‐, flow‐, photo‐, and electrochemical strategies. This review delineates ionic and radical manifolds for C–ONO2 bond formation, emphasizing mechanistic control, selected substrate scope, and selectivity.
Jayanta Dey, Dmitry Katayev
wiley +1 more source
Ingeniería e Investigación, 2008 The oxidising agent effect on R-(+)-Limonene epoxide diastereoselectivity using chiral and achiral Jacobsen’s type catalysts is presented. The type of oxidising agent strongly influences diastereoselectivity.
Juliana Reyes Calle +3 more
doaj
, 2019 Intramolecular imino-ene reaction of 2H-aziridine has been studied experimentally and computationally, demonstrating that (1) the concerted process takes place regioselectively on the alkene E-CH group; (2) the geometry of the N-linker impacts the ...
Ping Dai (235336) +15 more
core +1 more source
Stereochemical Control in the Matteson Reaction
Chemistry – A European Journal, EarlyView.The Matteson homologation is a highly versatile method for the stereoselective insertion of carbenoids into boronic esters. Through iterative application of the process, complex chiral molecules can be synthesized. The stereoselectivity of the reaction is determined by a chiral diol incorporated in the boronic ester.
Hae Mo Lee, Christoph Hirschhäuser
wiley +1 more source
MoleculesRing size-dependent diastereoselective coordination of unsymmetrical diamines containing one azacyclic nitrogen and one exocyclic nitrogen to [(η5-C5Me5)MCl]+ cores where M = Rh, Ir and [Ru(η6-cymene)Cl]+ is reported herein.
Vladimir Y. Vladimirov +4 more
doaj +1 more source
Enhanced Diastereoselectivity in the Asymmetric Ugi Reaction Using a New “Convertible” Isonitrile
, 2016 Enhanced Diastereoselectivity in the Asymmetric Ugi Reaction Using a New “Convertible ...
Sophie Binet (3046887) +2 more
core +1 more source